We are looking for a module or a solution to the following problem:

• We have a number of pages/tab/resources that we would like to "hide" behind a registration/login "wall".  By that, I mean we have some info that the public can see, but some we want to know who they are before they continue.
• This is a marketing/sales requirement, not a security one.  The login would be by email address only (NO PASSWORD).  We would not want the user to have to submit the email multiple times during the same session.  Registration would require some additional information.  There would be no need for viewing/editing profile.
• Tabs would be "marked" to be viewed only by users that are logged in (similar to the way role permissions work in core DNN).
• Here is the catch: we would like this to be "external" to the DNN Users (not necessarily external to DNN).  By this I mean, I don't want 50,000+ users in the Users table.

I hope that wasn't too vague.  Please feel free to ask questions.

Thanks